Plain English Meaning
A ring at the base of the propeller that flings alcohol out along the spinning blades to keep ice from forming on them.
Full Definition
A propeller anti-icing system component consisting of a slinger ring mounted at the propeller hub that distributes alcohol-based fluid outward by centrifugal force along the leading edge of each propeller blade to prevent or remove ice accumulation.
Context Anchor
Seen in discussions of propeller anti-icing equipment, especially on aircraft that use fluid rather than electric heat to protect the propeller from ice.